Toward the Development of a General Chiral Auxiliary. A Total Synthesis of (+)-Tetronolide via a Tandem Ketene-Trapping [4 + 2] Cycloaddition Strategy
- Robert K. Boeckman,
- ,
- Pengcheng Shao
- ,
- Stephen T. Wrobleski
- ,
- Debra J. Boehmler
- ,
- Geoffrey R. Heintzelman
- , and
- Antonio. J. Barbosa
Abstract

A highly convergent, enantioselective total synthesis of the aglycone of the tetrocarcins, (+)-tetronolide, is described. The synthesis highlights the use of several new methods, including camphor auxiliary-directed asymmetric alkylation and the enantioselective preparation of acyclic mixed acetals bearing chirality at the acetal center, and the highly efficient connection of the two major precursors via a ketene-trapping/intramolecular [4 + 2] cycloaddition strategy.
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